My friend Root mail Id got compromised. We cannot login to the account. What can we do

Hi, My friend root user Id got hacked. We cannot login into our AWS account. We didn't authorized any email updates as well, but it got updated. My card details were linked to the account. I am terrified If I gonna be charged for something I didn't use. The new mail Id it got updated to was: b.ayuhehanusa77@proton.me I raised the cases but no one contacted me. My Case Id: 10370293431. Someone Please help me out. I am so scared if this gonna effect my career.